Add project files.

SQLite_test/Classes/Crud.cs

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+using System;
+using System.Collections.Generic;
+using System.Data.Entity.Migrations.Model;
+using System.Data.SQLite;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SQLite_test.Classes
+{
+    internal class Crud
+    {
+
+        private SQLiteConnection _connection;
+        string connectionString = "Data Source=mydatabase.db;Version=3;";
+        
+
+        // Connection to the database would be established here
+        public Crud()
+        {
+            // Initialize database connection or any other setup
+            _connection = new SQLiteConnection(connectionString);
+            try
+            {
+                _connection.Open();
+                Debug.WriteLine("Verbinding met de database is geopend!");
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine($"Fout bij het openen van de database: {ex.Message}");
+            }
+        }
+
+
+        protected void Add()
+        {
+            // implement Add logic here
+        }
+
+        protected void Create() 
+        {
+            // Implement create logic here
+        }
+
+        protected void Read()
+        {
+            // Implement read logic here
+        }
+
+        protected void Delete()
+        {
+            // Implement delete logic here
+        }   
+
+    }
+}

SQLite_test/Classes/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SQLite_test.Classes
+{
+    internal class User : Crud
+    {
+
+        // call inherited methods from Crud class
+        public void AddUser()
+        {
+            Add();
+            
+        }
+
+        public void CreateUser()
+        {
+            Create();
+        }
+
+        public void ReadUser()
+        {
+            Read();
+        }
+
+        public void DeleteUser()
+        {
+            Delete();
+        }
+
+
+    }
+}